Machine tool working head



' Feb. 15, 1949.

F. G. HANSEN MACHINE TOOL WORKING HEAD Filed April 29, 1946 PatentedFeb. 15', 1949 UNITED STATES PATENT FFICE MACHINE TOOL WORKING HEAD FredG. Hansen, Toledo, Ohio Application A rii'29, 1946, SeriaPNo; 665,818 2Claims. (01. 77 s) iniin'tioh rlars w an accessory or attachment forcooperationwith the rotary element of-a "ptwr driven machinetool forcontrolling the radial'pro'gre'ss' of the tool, as in metal cutting.

"This invention has utility when incorporated as a boring head adaptedtobe rotated by a mahine-toolspindle, and having automatic feed orprogress determining means actuable from the rotation rate ofthe toolcarried by the head for changing th'e diameter of transit for such tool.

"Referring to the drawings:

Fig. 1 shows an embodiment of the invention as mounted onthespindle of avertical type boring machine, 'the machine being in outline indottedlines, and partly broken away;

Fig. 2 is an enlarged View, With parts broken away, of the attachmentand the adjustable control for'varying the radial position of the toolin operation;

Fig. 3 is "a fragmentary detail of the actuator for the feed screw aslocating the tool;

Fig. 4 isadetail view of the positioning scale or feed controlgraduations for determining the rate of progress of the tool, say in thenumber of cuts or transits per unit of radial distance change;

Fig. 5 is a detail View in plan of the kick-out arm, mounted'in thenon-rotary or stationary part of the head, and adapted to be thrust up,or lifted at its inn'e'rendby the radially traveling nut on the feedscrew, which nut carries the cutting tool; and

Fig. 6 shows the kick-out arm of Fig. 5, but here in side elevation, andas actuated by the nut, for shifting the feed stop knob radially outwardt'oa held position, so that in the succeeding rotatio'nthe yoke clearsthe radially toothed member from rotating the threaded feed shaftor'screw.

A vertical boring machine I has a motor 2 connected thru variousgearings and controls to rotate a vertical spindle 3 in opposition to anadjustable table 4 upon which work 5 may be located. The spindle 3operates in a non-rotary or fixed guide sleeve 6.

The accessory or unit of the head of this disclosure comprises anon-rotary housing 7 thru which a spindle element or rotary extension 8may extend, having anti-friction lateral bearing 9 in the housing I.Adjusting ring I0 completes the assembly of the bearing 9 in the upperhousing section 'I and a lower major housing section I I. sleeve 6 andthe top of theminor or upper housing section I is interposed frictionlock or wedge means l2, adapted to be adjusted thru screws I3 Betweenthe lower end of the stationary I 2 engaging the section 7 f orestablishing and maintai'ning a non-rotative asseinblyzfor 'the hou'singsection' 'l'.

The relatively rotatable lower housing section H is fixed withthespindle8 and has diametrically extendi ng th-erebelow a way lz llhavin'gi enribearings l5, it, for a feed screw I'i. Intermediate theb'earings I5,I'6,:in'the"way I' l, thereisa feed-=nuti8 on th-e'screw "l1.Depending'from this nut. it is a socket seat I9 for a tool bar 20,adapted to carry metal cuttingbla'des' 2 I adapted for'drilling, boring,under cutting, grooving, facing, in a full range for tool radial travelin or out in its circular orbits of operation. Key openings 22intheopposite ends of the feed'screw ll permit the insertion of a tool andits operation for locating true center, or a desiredloii-center positionfor maintained location for the-cutting tool during the spindlerotation.

Under t-he'inv'ention herein, this location may beauto'matically shiftedat a desired rateconstant. To this end, an adjustable couplinglis fixedon thescrew H to onesideof the nut tB and in the way I 4, beingan-an'nularly toothed member 2-3. the radial notches of which arec'0rnplementary to teeth 24 of an arm-xtfi, loosely mounted on the shaftI I.

A compression helical spring 26 main-ta'ins "the free endof the annttupward to'have abe'aring 2? ride against the un'derside of an adjustablecontrol ring fit. Depending' from the underside of the fix'ed housingsection I is a bracket 29 providing a pivot bearing 30 on an ear fromthe upper side, near one edgeyof the'rin'g 28. =Radially from the remoteside'of thisnon-rotaryti-ltable controlringtds an' arm 3textendingthruan opening *32 an a depending-skirt' 33- :fixedwith the housing 1 andabout and 'overthe lower 're1a-' tively rotary section II. Upon theprotruding portion of the rod or arm 3| is a knob or grip 34 normallythrust inward by a compression helical spring 35 to have diametricalknife edge projections 36 thrust into scale or graduation seats 37extending from the opposite sides of the opening 32.

With a diameter feed screw 11 at 20 threads per inch providing a radialtravel of 2 inches for the socket IS, the lowermost seat pair 31 at theopening 32 may be for locating the ring 28 untilted or horizontal. Thismeans that in each rotation of the spindle section 8 and the headsection II keyed to rotate therewith, the bearing 2! has no up nor downmovement relatively to the plane in which the screw I1 is traveling inits position crosswise of the spindle section.

memes Accordingly there is no rocking of the arm 25. In a layoutdeveloped under the schedule of dimensions disclosed, the succeedingupward pairs of seats 3'1, when there be 50 radial teeth in the member23 to coact with a similar number of complementary teeth 24 of the arm25, is that each step upward may mean .001 inch feed distance for thecutting tool 2|, herein shown as up to .007 inch. ihe spring 26 effectsthe idle or upthrust for the arm 25 to the high region of the ring 28.The rotation of the member Ii, carries the screw I1 and the arm 25 alongthe underside of the ring 28 to be thrust down and thru the meshrelation holding of compression helical spring 38 on the shaft H, therock distance of the arm 25 causes the teeth 23, 24, as in register tocause the fractional turn for the shaft [1.

From the foregoing, it is to be noted that the pull handle or grip 32,which may have a flat upper side portion 39 to bear a suggestivenotation to the machine operator to guide in the operation of thecontrol, at each rotation, thru the intermittent grip mechanism effectsa step-bystep feed rate. The feed may be in or out as to operation,according to the thread pitch and I end way 4 3 having a restrictedmedial section 45,

as carried by the knob 99, serves to engage an upstanding pin 46, in itsnext rotation, and pull such pin 46 and a fork 5? fixed therewith,outward. The fork i! is in a grooved collar 48 fixed with theintermittent grip toothed rockable mem ber 24, 25, and thus pulls theteeth 24 against the resistance of the spring 33 out of mesh with theteeth 23, to be so held by the spring stop 4| in the seat 43. This is amanual control disconnecting the automatic feed, so that the operatormay thrust a tool into a key seat 22 and reset the nut I 8 and the 'tool2! carried thereby.

For automatic stop operation, the nut l8 in the way l4 rides under atrigger 49 carried by the member H, and accordingly turning with the thespring seat 42 to have its seat 43 engaged by the stop 4!. Accordingly,as so held, the automatically outwardly thrust knob 40, as so located bythe feed nut It, now pulls the fork 47 to dis- 4' connect theintermittent grip feed. A torsion spring 5| swings the trigger 49 downas the nut I8 is cleared therefrom.

What is claimed and it is desired to secure by Letters Patent is:

1. A working head accessory for a machine tool having a sleeve, arotatable spindle in the sleeve provided with a seat, and an opposingwork table adjustable toward and from the spindle and sleeve; thecombination of a spindle element extension in the seat, a lateralbearing for the extension, a housing for the bearing comprising a firstsection adjustably fixed with relation to the sleeve and a complementalrelatively rotatable second section fixed relative to the extension,said housing providing a chamber between the sections, a ring in thechamber extending transversely to the axis-extended of the spindle andpivoted to one of the housing sections, a tilt adjustment device for thering as to the housing in which pivoted, a. tool holder having a nut, afeed screw for the nut rotatably mounted in the other housing sectionfrom that mounting the ring, and an adjustable coupling between the ringand screw for progressing the holder radially relative to the spindleaxis.

2. A working head accessory for a machine tool having a sleeve, arotatable spindle in the sleeve provided with a seat, and an opposingwork table adjustable toward and from the spindle and sleeve; saidaccessory comprising the combination of a spindle element extension inthe seat, a lateral bearing for the extension, 2. housing for thebearing including a first section adjustably attachably fixed with thesleeve and a complemental relatively rotatable second section fixed withthe extension, said housing providing a chamber about the extension andbetween the sections, a ring in the chamber pivoted to the first housingsection, a tilt adjustment device for the ring as to the first housingsection, a tool holder having a nut, a feed screw thru the nut androtatably mounted in the second housing section, and an adjustablecoupling coacting between the ring and screw for progressing the holderradially relatively to the spindle axis.

FRED G. HANSEN.

REFERENCES CITED The following references are of record the file of thispatent:

UNITED STATES PATENTS Number Name Date 836,715 Smith Nov. 27, 19062,079,197 Bergman May 4, 1937 2,166,852 Weiss July 18, 1939

